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  • Title: Deconvolution and compensation of mass spectrometric overlap interferences with the miniRUEDI portable mass spectrometer.
    Author: Brennwald MS, Tomonaga Y, Kipfer R.
    Journal: MethodsX; 2020; 7():101038. PubMed ID: 32963969.
    Abstract:
    The miniRUEDI is a portable mass spectrometer system designed for on-site analysis of gases in the environment during field work and at remote locations. For many gas species (e.g., He, Ar, Kr, N2, O2, CO2) the ion-current peak-heights measured with the mass spectrometer can usually be calibrated in terms of the partial pressures by simple peak-height comparison relative to a gas standard with well known partial pressures. However, depending on the composition of the analysed gases, the ion currents measured at certain m/z ratios may result from overlapping signals of multiple species (for example CH4, O2 and N2 at m / z = 15 and 16; or Ne, Ar and H2O at m / z = 20 ). Here, we present a method extension to the existing miniRUEDI peak-height comparison in order to resolve such overlap interferences: • We developed and tested a data processing procedure for accurate deconvolution and compensation of such mass-spectrometric overlap interferences. • The method was incorporated into the miniRUEDI open-source software (ruediPy). • The method substantially improves the analytical accuracy in situations where mass-spectrometric interferences cannot be avoided.
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